sebaceous adenoma

adenoma

[ad″ĕ-no´mah]

a benign epithelial tumor in which the cells form recognizable glandular structures or in which the cells are derived from glandular epithelium.

acidophilic adenoma in a classification system formerly used for pituitary adenomas, an adenoma whose cells stain pale pink with acid dyes; most adenomas that secreted excessive amounts of growth hormone were in this group

basophilic adenoma in a classification system formerly used for pituitary adenomas, an adenoma whose cells stain pale blue with basic dyes; most adenomas that secreted excessive amounts of adrenocorticotrophic hormone were in this group.

chromophobe adenoma (chromophobic adenoma) a pituitary adenoma composed of cells that lack acidophilic or basophilic granules; this is the same entity as the more precisely named null-cell a.

hepatocellular adenoma a large, fleshy, hypervascular tumor of the liver occurring chiefly in women of childbearing age and associated with oral contraceptive use. It is composed of sheets of cells with areas of hemorrhage and necrosis and has a tendency to hemorrhage and rupture; it may become malignant.

null-cell adenoma a pituitary adenoma whose cells give negative results on tests for staining and hormone secretion; although classically they were considered to be composed of sparsely granulated or degranulated (nonfunctioning) cells, some contain functioning cells and may be associated with a hyperpituitary state such as acromegaly or Cushing's syndrome. These tumors are often discovered clinically only when they have grown large and are pressing on surrounding structures. Called also chromophobic adenoma.

se·ba·ceous ad·e·no·ma

se·ba·ceous ad·e·no·ma

A benign neoplasm of sebaceous tissue, with a predominance of mature secretory sebaceous cells.

sebaceous

pertaining to or secreting sebum.

sebaceous adenitis

inflammation of the sebaceous gland; includes granulomatous lesions.

sebaceous adenoma

particularly common in the skin of aged dogs. On the eyelids they arise from the meibomian glands.

sebaceous cyst

a benign retention cyst containing sebum.

sebaceous epithelioma

basal cell tumor with sebaceous differentiation.

sebaceous gland

holocrine glands in the skin that secrete sebum usually through the hair follicles. They vary in size and activity between species and location. In dogs, large sebaceous glands are located on the dorsum of the tail (see tail gland) and at mucocutaneous junctions. In cats, large glands are located also on the dorsum of the tail, on the lip margins and under the chin (see submental organ).

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.